Collapsible mold.



J. W. CHAMBERS. ICOLLAPSIBLE MOLD. 'APILIOATION FILED APR. 30, 1913.

1,113,753. P a tented 00t.*13,191&

2 sHnETs-sHBET 1.

, WITNESSES /w/v on I Y j ATTORNEY J. W. CHAMBERS. COLLABSIBLE MOLD.APPLIOATYION FILED A-PR.,30, 191s.

INVENTUH WITNESSES UNITED srA-TEs PATENT ormcn Jenn wIoHaMB ERs, orminiatnron, MICHIGAN.

' ooLLArsIBLE MoLn.- j

: -To all whom may 50mm, 1

Be i known that I, JOHN W; Cimi-renns,'

citizen of the United States, residing at Middleton, in the'eounty ofGratiotand' State of Michigan, have invented certain new and *usefull'xnprot'emcnts in Collapsible Molds;

of which the following is a specification.

1 This intention relates to an improved bridge-form, and moreparticularly to a col- :lapsible mold adapted and intended to be .used.forexcavating purposes such as cul-' yert, sewerand tunnelconstructionl,

"1 An object of the invention is to provide simple and eflicientnieansfor expanding or collapsing the outer shell of the mold insuch anoveland peculiar manner that it maybe easily withdrawn when thestructure in connection with which it isused, is compl'eted. I

A still further object of the invention contemplates the provision of, aspecially devised form adapted to be arrangedupon the interiorofthe'shelh and operated from the exterior thereof, for enlarging ordiminishing thesize of the mold as occasion demands. The invention stillfurther resides in the provision of a plurality of detachable platemembers adapted to be employed in connection withthe invent-ion. foreffecting a substantially cylindrical mold form capable of limitedadjustment, the said adjustment being accomplished by the operation-of asuitable wheel forming a part of the interi r .frame. mechanism, thuspermitting the mold to be col apsed and quickly and readily withdra nfrom 'the structure after the walls thereof have become sufiicientlyhardened to remaiii intact.

The above and additional objects are accomplished'by such means as areillustrated in their preferred embodiment in the accompanying drawings,described in the follom'ng specification and then more particularlypointed outin the claims which are appended hereto and form' apart. ofthis application. r

In describing my invention in detail reference will be had to theaccompanying drawings wherein like characters denote like orcorresponding parts; throughout the several views, and in which vFigurel is-an elevation of a collapsible niold constructed in accordancewith my in- .vention; Fig.2 is an end View Fig. 3 is a longitudinal sectonal new F1g. 4 is a cross sectienal yiew; Fig; 5' is an enlarged sec-'onalyiew illustrating the manner in wh ch demands. v

By oueratingthe hand wheel-12in one v specification oi Letters Patent..Pate t d O t 13 19 Application iue'afa rn'so, i913.se'rialllo.76-1,59$.-

the plate members are retained upon the collapsible frame. ,Figr6 is adetail-perspective iew of one of the plate fasten'ing'memhers; and Fig.7 is a cross-sectional View. of the inner plates showmgthelr use as amold without the outer member.

Referringnow to the drawings, wherein 1 is illustrated the preferredform of .my in vention the numeral ldesignates a plurality of(preferably four) curved sheet metal plates, which are adapted toformwhen the" trams work upon which they are arranged is collapsed, a.substantially. cylindrical mold, the said plates being supported throughthemedium of a plurality of. arms I 2 radiating from a suitable hub 3-slidably mounted upon a concentrically disposed shaft 4 which extendsthroughout the length of the mold. The arms .2 are pivotally connectedas at 5 to suitable bracketstlv which are in turn permanently secured tothe inner face of the plates 1, the opposite end of the said arms beingpivotally secured as at 7 to ears 8 formed integrally with andprojecting vfrom the peripheryof the hub3 so as to allow tliesaid shaftto be laterally slid or moved independent of like movementton the partof the plates 1.

One end of the shaft 4, the said shaft being hollowed, is provided Witha oap 9 the said cap being threaded upon the said shaft and having acentral bore 10 formed therein through which an extcriorly screwthreaded rod 11 extends. The opposite end of the rod 11 from thatprojecting into the hollow shaft 4; has keyed or otherwise securedthereto a: hand wheel 12- for the purpose of rotating the screw rod 11for increasing or diminishing the size of the mold form in amanner to behereinafter fully described. collar 13 is loosely mounted upon the rod11' adjacent the handle 12, the said collar heing held against lateralmovement upon the said rOd through the medium of an annular flange 14formed integrally with the said rod. Connectingrods'15 radl ate from-thecollar 13 to which they are pi'rotally secured as at 16 and extend tosuitable brackets 17 secured to the inner face of the plate members 1near one extremity of the mold wherethey are'pivotally secured as'at 1S.Any suitable means such as a turn:-

buckle18' may be'arrangedupon the rods 15 for adjusting the lengththereof asoccasion direction -it will be seen that'the shaftt islaterally moved toward the said wheel while the plate members 1 arelikewise moved in a direction opposite to that of the said shaft 4,thereby collapsingordecr easing the size of. the" mold form and bringingthe several plates into closer proximity by reason of the pivotallyconnected'arms 2 colnpr1s1ng$ part of the operating means.

Lateral mo ementof the collar 13 is pre-- .ventedby reason of theannular flange 14;, this construction causing the rods 15 to 1mpartlateral movement to the plates'l according to therotat-ion of the handwheel '12.

Any number of. molds constructed as,

above described may be operated by one and the same hand wheel bconnecting the central -shatt thereof to tie hollow-shaft t as r isshown at 19 in thetdrawings'.

Detachable plate members 20 are employed in connection with theinvention whena' complete cylindrical outer shell is' desired, the-saidplates being arranged upon the outer face of the plate members 1' wherethey are supported by means of 'suitable fastening. members 21, the saidmembers being substantially T-shaped in elevation, the

crosshead 2 extending transversely of an elongated aperture orslot 23formed, within the. said detachable plates 20. Thevertically extendingportion 24 of'the fastening member is adaptedto extend through the saidslots 23 of the plates 20 and through an opening of the plate members 1where 'it is effectually retained by'means of a nut 26 threaded upon thesaid portion. as from the inner face ofthe said plate member 1. Re-

tainers 27 are secured to certain of. the plates 20 for the, purpose offetaining other of the that the mold form should be either increased. ordiminished insi'ze it will be seen that the slots 23 of the said plateswill permit limited adjustment of the said form,

such adjustment being accomplished by, the operation of the hand wheel12) above de scribed.

Y The retainers- 27 prevent, lateral movement of the plates '20 in onedirection and msiipporting the overlapping ends of; the

thereby force the overlapping end of the said plates to laterally move,during adjustment at the form, theiastening members 21 plates in thedesired manner.

It will be seen fromthe above taken ,in connection with the 'accompanying drawings that complete adjustment of the mold form-'controlled by the operation of the ha-nd h ee l 12, the said wheelbeing mounted pen the exterior of the said-form; that hv Where themetallicthe provision of thepiyoted arms'2, thesaid form'may be eitherincreased of; diminished in size as occasion demands} and that byproviding metallic? plates of yarious' sizes, 'size's'may beeiiected bythe operation ofthe hand gwhel112 in the mannerfaboye .describedi 4 s Inreduction to "practice, I have found inthe drawings-and referred to inthe above description, as the preferred embodin1ent, is the mosteflicient and practical; yet realising that the conditions concurrentsarily vary, I desire to emphasize the fact that various minor changesin details of of parts may be'resorted to, when required,

of my. invention, as defined in the appended claims. f

Having thus fully described myinve'ntion,

Letters Patent, 1s:

j 1. A collapsible mold includin an inner shell composed ofa plurality onormally spaced segmental plates, an outer shell composed of a likenumber of overlapping platesgand 'slidably engaging said overlappingplates to maintain the latter adjustable thereupon, and meansengageablewith said segmental plates for adjusting said the size of themold. 2. A collapsible mold including an inner expansible shell, anouter 'expansible shell, means rigid with said inner shell and slid ablyengageable with said outer shell to maintain said outer shell thereupon;and means-operable Within the inner shell for expanding or contractingthe mold.

3Q AL collapsible mold including an inner expansible shell, an outershell composed of a plurality of shell sections, the said sections beingdisposed to overlap one another,

certain of the said shell sect'ons having alined slots formed therein,means rigid -With fsaid{inner shell and working within said slots toprovide for the lateral adjust-- ment of saidouter shell sections, andmeans 'carriedby'certain of said sections and engagea-ble with other ofsaid shell sections to maintain the said sections incapable of outwardseparation, as and for the purpose.

setforth; U

4. A collapsible mold including an inner shell ,composed'of a pluralityof shell sections, an outer shell composed of alike number of. shell'sections, said outer shellsections being disposed. -'t0.. o'verlapone amnion-certain oi'the 'said' outer shell secitions 'havin'g alinedslots formedqtherein,

means by certain of saidouter shell complete 0 'lindrical outer shellsof various that theiform-ofmy invention, illustrated with the adoptionof my device will necesg construction, proportion and arrangement aWithout sacrificing any of the advantages 3;

whatI claim asnew and desire to secure by 7 t 9 plates,'mean's rigidwith said segmental 9 overlapping plates to increase and diminish 1 faid outer shell; sections-to. maintain the isect'ions incapable:of'outward separaa removable fastening. member rigid .With said innershell and working within said-slots of said outer shell to. maintain thelatter upon said inner shell'incapable of outward separation, and meansoperable within the inner shell and engageable with 10 the said innershell'sectionsfor adjusting said outer shell sections laterally toincrease and diminish the size of the mold.

5. A collapsible mold including an inner expansible shell, an outerexpansible shell,

' 15 means connecting the said two shells to exadapted for engagemeritwith ,other pand the latter according to the expansion 5 of the former,an operating screw mounted concentrically Within the said inner shell,screw arms connecting the said screw to the said inner shell, andturn-buckles operable 20 upon the said arms the screw and arms providingfor the expansion of said inner shell, as and for the purpose set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN W. CHAMBERS.

Witnesses:

JNO. R. HUDSON, E. MAE RICHARD.

